Physics, 15.07.2021 01:40 doris8051

1. The tennis coach at Kingston High School wants to videotape his varsity
players to evaluate their form when
serving the ball. He is concerned that
the presence of the video recorder
will make some of the players
nervous and affect their service form.
He decides to conduct an experiment
and randomly chooses half of his
players to be videotaped and the
remaining half not to be taped. Then
he will see if having a video camera
on the court affects his players by
noting what percentage of serves by
players in both treatment groups are
successful.
The control variable in his proposed
experiment is the:
Answer choices:
serving percentage.
video recording.
varsity players.
nervousness

Answers: 2

Show answers

Another question on Physics

Physics, 22.06.2019 02:30

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Answers: 2

Answer

Physics, 22.06.2019 18:00

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Answers: 3

Answer

Physics, 22.06.2019 21:30

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? a b c d

Answers: 2

Answer

Physics, 23.06.2019 02:00

Answer asap 50 points which of the following illustrates how a venus fly trap senses that an insect has landed in its open leaves? 1. using tiny hairs, the leaves sense a change in light. 2. using tiny hairs, the leaves taste a chemical. 3. using tiny hairs, the leaves detect a touch. 4. using tiny hairs, the leaves sense a change in water levels.

Answers: 1

Answer

You know the right answer?

1. The tennis coach at Kingston High School wants to videotape his varsity
players to evaluat...

Questions